1. Allen RG, Pereira LS, Raes D, Smith M (1998) Crop evapotranspiration – Guidelines for computing crop water requirements. FAO Irrigation and Drainage Paper 56. Food and Agriculture Organization, Rome, Italy.
2. Ångström A (1924) Solar and terrestrial radiation. Quart J Roy Meteorol Soc 50:121–125
3. Chattopadhyay N, Hulme M (1997) Evaporation and potential evapotranspiration in India under conditions of recent and future climatic change. Agr Forest Meteorol 87(1):55–74
4. Chen S, Liu Y, Thomas A (2006) Climatic change on the Tibetan Plateau: potential evapotranspiration trends from 1961–2000. Clim Chang 76(3–4):291–319
5. Doorenbos J, Pruitt WO (1977) Guidelines for predicting crop water requirements, FAO Irrigation and Drainage Paper 24. Food and Agriculture Organization of the United Nations, Rome